the elements

Lesson3

The elements around us
Classitication of elements:
Elements are classified into two groups:
1-metals 2-non-metals
Properties of metals:
1-they have luster (they are shiny)
2-they are good conductors of electricity.
3-they are good conductors of heat.
4-they are malleable and ductile (can be hammered, bent and pulled into the shape of wires)
5-they have high melting points.
6-all metals are solid at room temperature except mercury which is a liquid.
example: iron,copper and aluminium


properties of non-metals:
1-they not having luster (they are not shiny).
2-they are bad conductors of electricity except carbon
3-they are bad conductors of heat.
4-they are not malleable or ductile(can not be hammered, bent or pulled into the shape of wires)
5-they have low melting points.
6-non-metals may be:
solids such as carbon and sulphur.
b-liquids such as bromine.
gases such as oxygen
a comparison between metals and non-metals:






Metals
1-they have luster (they are shiny).
2-they are good conductors of electricity.
3-they are good conductors of heat.
4-they can be hammered, bent and pulled into the shape of wires.
5-they have high melting points.
6-all metals are solids at room temperature except mercury which is a liquid.

Non-metals
1-they not having luster (they are not shiny).
2-they are bad conductors of electricity except carbon.
3-they are bad conductors of heat.
4-they can not be hammered,bent or pulled into the shape of wires.
5-they have low melting points.
6-non-metals may be:
a-solids such as carbon and sulphur.
b-liquids such as bromine.
gases such as oxygen.
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